APA (7th ed.) Citation

Snel, M., Shordt, K., & Graaf, S. d. (2003). School sanitation and hygiene education indicators.

Chicago Style (17th ed.) Citation

Snel, Marielle, Kathleen Shordt, and Sascha de Graaf. School Sanitation and Hygiene Education Indicators. 2003.

MLA (9th ed.) Citation

Snel, Marielle, et al. School Sanitation and Hygiene Education Indicators. 2003.

Warning: These citations may not always be 100% accurate.